Freshwater macroalgae has competitive advantages compared to microalgae and marine macroalgae, such as lower separation and drying cost requirements and an abundance of available freshwater media. Municipal wastewater containing large quantities of nutrients (particularly nitrogen and phosphorus) is a valuable and underutilized resource. In this study, the cultivation of the naturally isolated filamentous freshwater macroalgae Spirogyra sp. was investigated in three different types of municipal wastewater including primary (PW), secondary (SW) and centrate (CW) wastewaters. Two different types of reactors including closed column photobioreactors and open rectangular aquarium reactors were operated under no and low air flow rates of less than (18 ± 2) cm⁻³·min⁻¹, respectively. The SW, PW diluted with water to a 20 % volume fraction and CW diluted with water to a 2 % volume fraction appeared to promote ash-free biomass productivities of (2.17-6.68) g·m⁻²·d⁻¹ and specific growth rates of (16.4–29.7) %·d⁻¹. Nitrogen and phosphorus removal efficiencies ranged from (50.6–90.6) % and (60.4–99.1) %, respectively. Based on ultimate analysis, the biomass produced a higher heating value of (12.4–17.1) MJ·kg⁻¹, and also showed relatively consistent protein ((16.7–19.5) % of the dry mass fraction), carbohydrate ((41.5–55.0) %) and lipid ((2.8–10.0) %) contents. These results indicate the feasibility of using Spirogyra sp. to recover nutrients from multiple municipal wastewater sources with the simultaneous production of biomass that contains value-added biochemical components for bioenergy and biofuel applications.

淡水大型藻类与微藻和海洋大型藻类相比具有竞争优势，例如较低的分离和干燥成本要求以及大量可用的淡水介质。含有大量养分（尤其是氮和磷）的市政废水是一种宝贵且未被充分利用的资源。在这项研究中，自然分离的丝状淡水大型藻Spirogyra sp的栽培。在三种不同类型的市政废水中进行了调查，包括一次（PW），二次（SW）和离心（CW）废水。两种不同类型的反应器，包括封闭的光生物反应器柱和打开矩形水族馆反应器没有下和低的小于（18±2）厘米的空气流率操作^-3 ·分钟^-分别为¹。的SW，PW用水稀释至20％的体积分数和CW用水至2％体积分数稀释似乎促进的（2.17-6.68）克·米的无灰的生物质生产力^{- 2} ·d ^{- 1}和特定生长（16.4-29.7）％·d ^{− 1的}比率。氮和磷的去除效率分别为（50.6–90.6）％和（60.4–99.1）％。根据最终分析，生物质产生的热值更高（12.4-17.1）MJ·kg ^-1，并且还显示出相对一致的蛋白质（占干质量分数的（16.7-19.5）％），碳水化合物（（41.5-55.0 ）％）和脂质（（2.8–10.0）％）含量。这些结果表明使用螺旋藻的可行性sp。可以从多个市政废水源中回收养分，同时生产生物质，其中包含用于生物能源和生物燃料应用的增值生化成分。